Each style of karate-do has formed his own katas as forms of exercise. In Shotokan there are 27 katas, which have to be learned gradually.
Katas for student grades
Taikyoko Shodan, Heian Shodan, Heian Nidan, Heian Sandan, Heian Yondan, Heian Godan, Tekki Shodan
Compulsory exercises for black belts
Bassai Dai, Kanku Dai, Jion, Empi, Hangetsu
Bassai Sho, Kanku Sho, Jiin, Jitte, Gankaku, Nijushiho, Chinte, Sochin, Wankan, Meikyo, Tekki Nidan, Tekki Sandan, Gojushiho Dai, Gojushiho Sho, Unsu.